Today I was firing my combustion. It was't firing right because the screws shifted. I opened the cap, pressed the ignition, and BOOM ALL OVER MY FACE it exploded and destroyed the threading on it. Luckily I only lost some hair because I was wearing safety googles.

Yeah that happened with mine because I left my friend with it alone for 5 min. If the threads are melted together just use a razor blade or a file to cut apart the stuff inbetween them. But if they are too messed up just buy a new one it will cost you maybe $1.